Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 10047.7998046875 | Thousand metric tons of contained nitrogen | NA |
| 2004 | 10717.599609375 | Thousand metric tons of contained nitrogen | 6.67% |
| 2005 | 10800 | Thousand metric tons of contained nitrogen | 0.77% |
| 2006 | 10900 | Thousand metric tons of contained nitrogen | 0.93% |
| 2007 | 11000 | Thousand metric tons of contained nitrogen | 0.92% |
| 2008 | 11100 | Thousand metric tons of contained nitrogen | 0.91% |
| 2009 | 11200 | Thousand metric tons of contained nitrogen | 0.90% |
| 2010 | 11500 | Thousand metric tons of contained nitrogen | 2.68% |
| 2011 | 11800 | Thousand metric tons of contained nitrogen | 2.61% |
| 2012 | 12000 | Thousand metric tons of contained nitrogen | 1.69% |
